edit

src/main/java/org/usf/jquery/core/FunctionOperator.java

@@ -15,6 +15,6 @@ default void sql(SqlStringBuilder sb, QueryContext ctx, Object[] args) {
 	}
 
 	default void sql(SqlStringBuilder sb, QueryContext ctx, Object[] args, int from) {
-		sb.function(id(), ()-> ctx.appendLiteralArray(sb, args, from)); //avoid array copy
+		sb.function(id(), ()-> ctx.appendLiteralArray(sb, args, from)); //avoid sub array
 	}
 }

src/main/java/org/usf/jquery/core/KeyValueMapper.java

@@ -33,4 +33,4 @@ public List<DynamicModel> map(ResultSet rs) throws SQLException {
 		log.trace("{} rows mapped in {} ms", res.size(), currentTimeMillis()-t);
         return res;
     }
-}
+}

src/main/java/org/usf/jquery/core/SqlStringBuilder.java

@@ -65,19 +65,22 @@ public <T> SqlStringBuilder runForeach(T[] arr, String delimiter, Consumer<T> fn
 	}
 
 	public <T> SqlStringBuilder runForeach(T[] arr, int idx, String delimiter, Consumer<T> fn, String prefix, String suffix) {
-		if(idx < 0 ||  (isEmpty(arr) && idx > 0) || idx >= requireNonNull(arr, "arr connot be null").length) {
-			throw new IndexOutOfBoundsException(idx);
-		}
-		sb.append(prefix);
-		if(!isEmpty(arr)) { //idx < arr.length
-			var i=idx;
-			fn.accept(arr[i]);
-			for(++i; i<arr.length; i++) {
-				sb.append(delimiter);
+		requireNonNull(arr, "arr connot be null");
+		if((arr.length == 0 && idx == 0) || idx < arr.length) {
+			sb.append(prefix);
+			if(!isEmpty(arr)) { //idx < arr.length
+				var i=idx;
 				fn.accept(arr[i]);
+				for(++i; i<arr.length; i++) {
+					sb.append(delimiter);
+					fn.accept(arr[i]);
+				}
 			}
+			sb.append(suffix);
+		}
+		else {
+			throw new IndexOutOfBoundsException(idx);
 		}
-		sb.append(suffix);
 		return this;
 	}